Shuttle-case.



F. N. LA CHAPELLE.

SHUTTLE CASE.

APPLICATION FILED IULY23, 1910.

Patented July 18, 1915.

COLUMBIA PLANogIzAPr-I Co., WASHINGTON, D. c.

trarre `e i FRED N. LA CHAPELLE, 0F BEVERLY, MASSCHUSET-TS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, 0F PATERSON, NEW JERSEY,

JERSEY. v

A CORPORATION 0F NEW SHUTTLE-CASE.

Specification of Letters Patent. i Patented July lf3, 1915..

Application led. July 23, 1910. Serial No. 573,13?.

To all whom "it may concern Be it known that l, FRED'N. LA CHAPELLE, a citizen of the United States, residing at Beverly, in the county of Essex` and State of Massachusetts, have invented certain new and useful Improvements in Shuttle- Cases; and l do hereby declare the following to be a full,clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to improved shuttle and bobbin cases for lock stitch shoe sewing machines.

In shuttle cases as structed a certain amount of longitudinal play is left whereby the bobbin case may be moved backward and forward, and when the thread is pulled down across the front face of the bobbin case between it and the retaining door, the bobbin case is pushed backward by the thread to allow space for the thread to slip downwardly between the front of the bobbin case and the door. Since there is this longitudinal free play allowed the bobbin case, the bobbin case must depend entirely upon the nicety of the bearing of its peripheral-surface in the shuttle to resist any tendency to twist or bind on its bearing. 1When thebearing between the bobbin case and the shuttle becomes worn from use, there is a tendency for the bobbin case to bind on its bearing and hence it will not always be freely thrown backward by the thread, and in consequence the thread is caught between the front face of the bobbin case `and the retaining door and snapped. Since the thread is pulled olf through a thread delivering button or projection on the front facey of the bobbin case, whenever thereis tension put upon the bobbin thread to set the stitch or to draw off a fresh supply of thread for the next succeeding stitch, there is a torque or tendency to twist the bobbin case against its annular bearing about an approximately horizontal aXis, drawing the top of the bobbin case forward, this being prevented only by the accuracy of the fit of the bobbin case in its bearing, and as this bearing becomes wern there will always be some twisting of the bobbing case in its bearing when the thread is tensioned.

@ne object of my invention is to provide an improved shuttle case in which the now usually con-r bobbin @Se may .it an rimes be had posistructed has a solid front with a small oil hole. When. the machine becomes heated in use, the wax upon the cop or ball of thread in the bobbin melts and oozes out, causing the bobbin to stick in its case and also blocking up the oil hole, preventing the eliicient oiling of the bobbin in its case.

Another objectof my invention is to provide meanswhereby such waX as may melt and ooze between the bobbin and its case shall be automatically removed or scraped away, landto also provide means whereby the bobbin may be easily oiled.

A still further object of my invention is to cut away certain parts of the shuttle mechanism, thereby lightening the parts and reducing their inertia. l

My invention also contemplates certain other features of construction particularly defined in the claims.

In the drawings accompanying this application ll have illustrated a preferred form of my invention as applied to the wellknown Goodyear rapid outsole stitcher which is illustrated and described in the patent to French and Meyer No. i73,870, April 26th, 1892. It will be understood, however, that my invention is equally applicable to other lockstitch sewing machines, andthat it can be otherwise embodied without departing from the spirit thereof.

Referring to the drawings Figure l is a front elevation of the shuttle mechanism embodying my invention; Fig. 2 is a view taken partly in cross section along the line 2-2 of Fig. l; while Fig. 3 is a front view similar y to Fig. l and diagrammatically showing the bobbin case in `different positions.

.Referring to the drawings, l indicates the stationary shuttle race or casing, 2 the oscillating shuttle-throwing shaft bearing upon its end the plate provided with the shuttle-driving projections a and 5.v` A. ring 6 secured to the shuttle casing by screws 7 retainsthe discoidal shuttle 8 in place by bearing against the peripheral flange 9 of the shuttle. The-construction and arrangement of thesey parts is substantiallythe same as the correspondingparts described inthe patent to French and Meyer hereinbefore referred to.

Pivoted tothe casing by any suitable locking hinge 1Q,4 isa bobbin. case retaining door` 11. This door is positioned upon ,the front.

of the bobbin case by having its'flanged edge 12y fitting over.. the outwardly proj ecting4 lip or flangell. formed upontheretaining ring l case 17 slidesbackand forth preventingthe rotation of thebobbinzease, -at the `same time there being ysuflicient space left between the .buttonl and, its groene.v 15 to allow the needle lthread y to be ,drawny therebetween, as providedv in the structure"described in the F rench.V and Meyerpatent.l The' door has portionsthereof atlS and 19 cutaway to lighten its .constructiomandfto .allow free access Ato the rbobbin ease. The -interior of thedoor is provided with an` annular bearing surface 2O extending. from a point marked 21 toa pointanarked 22, thelower portion. of thecompletecircle of the bearing surface beingfcut away between points 21 andf 22 to.,allow free v.space .for the needle threadloop to slip on ;and.;off the. shuttle. That central part Yof the interior ofV the door which is ,surrounded by thebearing surface,

, is recessed below the planev of the bearing surfacersuiiicientlytoallow a space between suchcentral part'land thebobbin casefor, a threadtoslipthrough. j The bobbin case 17 isprovide'd with azithread ,feedingbuttonld bobbin 23 fand thread tensioning device of theyusnalleonstruction, thebobbin case beinglield to rotatably turn in the shuttle. y The front endvface ofthebobbincaseis provided withl'thelusualE beveledge24 and toward the ycentraljportion ofL thefront wall ofthe bobvbin case vare -formed.thecut-awayportions 25, Atherefbeingleft an annular bearing space 26of -solid 1metal,` between the beveled portion 24C and theputer :edges ofthe cutaway portions 25 exceptwvhere .thebutton 16 p rojects. y This solidportionf26 ljust ;within the beveled edge.24; will.l at all `times at some point ofits surfacebeengaged by .somepart of the innerbearing surface 2() of themetainingA door, thev clearance of, the Y shuttle casebeing-such that no looseiplay ofgthe bobbinv case is allowed. longitudinally gbeltween its rear, bearingLsurface` 27 in ,the shuttle` and 1 the bearing surface 2O .upon the retaining (door, the bobbinbase thus being at alltimes heldpesitively in place. The var ionspositions of the bobbin case are diagramma-tically shown as at A, B and C in Fig. 3,

and. the bobbin case.

while in Fig. 1 the bobbin case is shown in still another positionV marked D. When the bobbin caselis iny position A the front face of the bobbin will bear against the bearing or retaining surface 20 at a, while in the position B of bobbin case the bobbin case will be retainedvby bearing against a portion at b ofthe. bearing surface 20. In the position D of bobbin case, it will bear at d against the bearing surface 20, and when the bobbin casev is in position G it will be retained by bearingat two points c c against the bearing surface 2O. Thus it will be seen that whatever position vthe bobbin case may assume it will beretained in place by the bearing or retain-ingsurface 20 of the retaining door. VVhenthe beak 28 of the shuttle 8 is entering the ,loop of the needle thread,` the bobbin case bearsagainstfthe upper part of the bearing or retaining surface 20 as shown at a. As the shuttle is turned through the loop of needlethread the surface of engagement between th'e front surface of the bobbin case and its retaining surface 2O `travels at first downwardly andv to the left, as shown in Fig. 3 assuming in sequence the positions c and CZ. Thus it will be seen that, as the bobbin `case is retained at a portion only of its surface by the surface 20,. there will hc a free thread slipping space between all other parts of the shuttle and bobbin case, and the retaining door. lVhen the beak of the shuttle enters the loop of the needle thread there is a perfectly free clearance space between the bobbin case and the end 22 of the bearing surface 20, thebobbin case being retained yby-the upper part of the surface 20, As thethread travels over the shuttle, the surface of engagement between the bobbin caseand retaining surface 2O travels downwardly to the left, the point of engagement ofthe bobbin case and the retaining surface 2O always traveling before .the loop of thread untilthe front of the bobbin case finally slips off the lower end21 of the bearing surface 2O and isengaged entirely by the end 22 ofi the bearing surface 20, the shuttle finally assuming the position shown in Fig. 1, whichallows the thread loop to be pulled off between the Aend 21 of the bearing surface j It will thus be seen that there will, always be provided a free clearance space for the needle thread to slip through between the front of the bobbin case andthe door, as itv travels about the shuttle.

There are vtwo positions of the bobbin case in. lwhich tension is put upon the bobbin thread,\irst, when the stitch is being set in the work, this position being shown as at D in Fig.` 1,' and, second, when the bobbin rises and threadis pulled ofl'the bobbinin preparation for the next succeeding stitch, this position of the bobbin being indicated as A in Fig. 3. It will be noticed that in both of these positions the bobbin case is held in position by the bearing of its upperl portion against the upper part of the retaining surface 20. This is of particular advantage since when tension is put upon the bobbin thread there is a tendency to twist the bobbin case and draw its upper part forward. This twisting is entirely prevented in my improved shuttle case, the bearing surface 20 firmly holding in the upper part of the bobbin case, even when the peripheral bearing between the bobbin case and the shuttle becomes worn by use, there being only suiicient clearance allowed between the bearing surface 20 and the bobbin case to allow the shuttle to freely rotate. There is in both of these two positions a comparatively large surface of engagement between the bobbin case and the bearing surface 20, since in neither of these positions is the bobbin case near the position marked C where part of the bearing surface 20 is cut away.

Since the front of the bobbin case is cut away at 25 the bobbin itself is exposed through these cut-away portions. Vhen the melted wax oozes or works between the bobbin and its case, the sharp inner edges of these perforations 25 serve to scrape the wax from the front surface of the bobbin, and the wax thus scraped will fall downwardly free from the mechanism, and cannot clog the machine. These comparatively large openings 25 allow sufficient space so that the bobbin itself may be easily oiled, the cutaway portions 18 and 19 of the door allowing easy access to the front of the bobbin case. Tn the form of door as now usually constructed the bobbin case strikes against the door not only near its edge, but also at points which are nearer to the center of its front surface so that with the present form of door, it is necessary to use a bobbin case with a solid front face, and it is not possible to use a bobbin case having comparatively large cut-away portions 25 which I am enabled to employ in my improved device, since the outer edges of these cut-away portions would catch on the usual form of retaining door. ln my device, since the bobbin case bears against the door only near its edge, T am enabled to cut away comparatively large portions of its front surface to allow the inner edges of these perforations Q5 to scrape away the waX, afford easy oiling, and also lighten the construction of the bobbin case. This I am enabled to accomplish by the combination of a bobbin case with portions of its front wall cut away, together with a retaining door which affords means for retaining the bobbin case in place by bearing against the front face of the bobbin case only at points near its circumference.

Having thus described the nature and scope of my invention, what l claim is 1. The combination. of a shuttle case comprising a retaining front having an interior annular bearing surface and a bobbin case having portions of its front walls cut away, whereby the bobbin may be automatically cleaned, substantially as described.

2. The combination of a shuttle case com-` prising a retaining front having an interior annular bearing surface and a bobbin case always bearing at points near the periphery of its front wall against said annular bearing surface, the front wall of the bobbin case being cut away at certain points lying within that part of its surface engaged by the annular bearing surface, substantially as described.

8. The combination of a bobbin case and a shuttle case comprising a closure having a bearing surface which retains the bobbin case in all positions by bearing on the bobbin case at points near the periphery of its front wall, certain points of the front wall of the bobbin case being cut away, whereby the bobbin is partially exposed, substantially as described.

ll. A sewing machine, having, in combination, a discoidal shuttle, a bobbin case mounted in the shuttle to be carried by the shuttle in a circular path abc-ut the axis of rotation of the shuttle, and a shuttle case having a substantially flat annular bearing surface adapted to bear against the end of the bobbin case to retain it in the shuttle, substantially as described.

5. A sewing machine, having, in combination, a rotary shuttle, a bobbin case mounted in the shuttle to be carried in a circular path about the axis of rotation of the shuttle, and a shuttle case having an annular bearing surface adapted to bear at all times against a single point near the periphery of the end face of the bobbin case, said pointo'f contact traveling continuously along l"the face of the bobbin case during the motion of the shuttle, whereby the bobbin case is retained in the shuttle and a free thread slipping space is alwavs provided between the face of the bobbin case and the said bearing surface, substantially as described.

6. A sewing machine, having, in combination, a discoidal shuttle having a circular recess adapted to receive a discoidal bobbin case located eccentrically of the shuttle, bobbin case and a shuttle case having a substantially fiat annular bearing surface adapted to bear against the end face of the bobbin case, substantially as described.

7. A sewing machine, having, in combiiao y nation, a discoidal shuttle, a discoidal bobbin case rotatably mounted in the shuttle eccentrically to the shuttle, and a shuttle case having a substantially flat annular bearing surface lying in a plane at right angles to the axis of rotation of the shuttle and adapted to contact with an end face of the bobbin case, substantially as described.

8. A sewing machine,l having, in combination, a discoidal shuttle, a discoidal bobbin case rotatably mounted inthe shuttle eccentrically` to the shuttle, and a shuttle 5 case having a smooth annular bearing surface adapted' to bear against the bobbin case to retain it in the shuttle, substantially as described.

9.y A sewing machine, having, in combination, a discoidal shuttle having a cylindrical cup-like recess located eccentrically of the shuttle, a cylindrical bobbincase rotatably mounted in said recess andhaving a flat annular'. bearing surfaceon' its end face, and a shuttle case having a surface adapted to bear against the flat bearing surface of the bobbin case to retain the bobbin case in the shuttle, 4substantially as described.

`l0. A sewing'machine, having, in combination, a discoidal shuttle, a discoidal bobbin case supported withinand carried by `the kshuttle ina circular path about .the axis f of rotation'of-the shuttle, and a shuttle case having an abutment bearing against the end of the bobbin.l case in all of its positions to retain it in theshuttle, theend-of the bobloin'case and the abutment being constructed f andk arranged to provide a free thread slipping space over the end of the bobbincase, substantially as described.

ll. vA sewing machine, having, in combination, a rotary discoidal shuttle having in its front face a circular cup-lilrerecess located eccentrically tothe shuttle, a discoidal .bobbin case having a substantially Hat -front end face, a shuttle case comprising a -door having an interior flat annular bearing` j l surface substantiallyv concentric with the 4-Gopies of this patent may be obtained for lshuttle adapted to alwaysbear against the of said recess whereby the face of the bobbin next said closed end is automatically cleaned, substantially as described.

13. A bobbin case for a wax thread sewing machine having a bobbin receiving recess and having means for automatically clearing the surface of the bobbin of wax, substantially as described.

14:. The combination of a bobbin case having a rear opening for the insertion of the bobbin and having a portion of its front face cut away, and a shuttle case comprising a door having an interior bearing surface adapted to contact with the front face of the bobbin case and having an aperture cut through it within said bearing surface, substantially as described.

15. The combination in a wax thread sewing machine of a metallic bobbin upon which waxed thread isv wound and a` bobbin case having a bobbin-receiving recess and provided with a scraper engaging the surface of the bobbin to scrape wax therefrom, substantially as described.

FRED N. LA CHAPELLE.

Vitnesses:

CHESTER E. ROGERS, LAURA M. GooDRIDGE.

ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

